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參數(shù)資料
| 型號(hào)： | 74LS298 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Quad 2-Port Register Multiplexer with Storage |
| 中文描述： | 四2端口復(fù)用器注冊(cè)與存儲(chǔ) |
| 文件頁(yè)數(shù)： | 3/4頁(yè) |
| 文件大小： | 43K |
| 代理商： | 74LS298 |
3
www.fairchildsemi.com
DM74LS298
Absolute Maximum Ratings(Note 1)
Note 1: The “Absolute Maximum Ratings” are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommended Operating Conditions” table will define the conditions
for actual device operation.
Recommended Operating Conditions
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Note 2: All typicals are at VCC = 5V, TA = 25°C.
Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Switching Characteristics
at VCC = +5V and TA = +25°C
Supply Voltage
7V
Input Voltage
7V
Operating Free Air Temperature Range
0
°C to +70°C
Storage Temperature Range
65°C to +150°C
Symbol
Parameter
Min
Nom
Max
Units
VCC
Supply Voltage
4.75
5
5.25
V
VIH
HIGH Level Input Voltage
2
V
VIL
LOW Level Input Voltage
0.8
V
IOH
HIGH Level Output Current
0.4
mA
IOL
LOW Level Output Current
8
mA
TA
Free Air Operating Temperature
0
70
°C
tS (H)
Setup Time HIGH or LOW
25
ns
tS (L)
S to CP
25
tH (H)
Hold Time HIGH or LOW
0
ns
tH (L)
S to CP
0
tS (H)
Setup Time HIGH or LOW
15
ns
tS (L)
I0x or I1x to CP
15
tH (H)
Hold Time HIGH or LOW
5.0
ns
tH (L)
I0x or I1x to CP
5.0
tW (H)
CP Pulse Width HIGH or LOW
20
ns
tW (L)
20
Symbol
Parameter
Conditions
Min
Typ
Max
Units
(Note 2)
VI
Input Clamp Voltage
VCC = Min, II = 18 mA
1.5
V
VOH
HIGH Level Output Voltage
VCC = Min, IOH = Max, VIL = Max
2.7
3.4
V
VOL
LOW Level Output Voltage
VCC = Min, IOL = Max, VIH = Min
0.35
0.5
V
IOL = 4 mA, VCC = Min
0.25
0.4
II
Input Current @ Max Input Voltage
VCC = Max, VI = 7V, VI = 10V
0.1
mA
IIH
HIGH Level Input Current
VCC = Max, VI = 2.7V
20
A
IIL
LOW Level Input Current
VCC = Max, VI = 0.4V
0.4
mA
IOS
Short Circuit Output Current
VCC = Max (Note 3)
20
100
mA
ICC
Supply Current
VCC = Max, I0n, I1n,
21
mA
S
= GND, CP =
Symbol
Parameter
RL = 2 k, CL = 15 pF
Units
Min
Max
tPLH
Propagation Delay Time
LOW-to-HIGH Level Output
25
ns
CP to Qn
tPHL
Propagation Delay Time
HIGH-to-LOW Level Output
25
ns
CP to Qn
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